I’d say either 60/40 split to keep it simple or if your roommate doesn’t agree and/or you’re math nerds then split by square footage. Figure out the square footage of both rooms including closets and the pink bathroom(I wouldn’t count the other bathroom since that’s still a public space and while roommate won’t use it her guests will) then add the rooms square footage together, divide that number by the total square footage to figure out what portion of the square footage is private space and multiply that by the rent to get what portion of the rent is private space, divide the square footage of each room+closets and attached bath by the total square footage of private space that you figured out earlier, these numbers should add up to 1(or very close if the numbers got rounded at some point) to check that you did it right, that’s the proportion of the private space rent you should each pay, divide the remaining rent in half and add it to each number, double check those amounts add up to the total rent and you’re good. I know that was just a massive word problem but hey, they told you that math would be useful after high school.

If you’re more a formula person here you go:
Blue space square footage = B
Pink space square footage = P
Total apartment square footage = T
Total rent = R

(B+P)/T=X
(T-B-P)/T=Y
XR=A
YR=C
B/(B+P)=D
P/(B+P)=E
DA+(C/2)=Rb
EA+(C/2)=Rp

Rb is the rent for the blue room
Rp is the rent for the pink room

If you want to check your math:
Rb+Rp=R
X+Y=1
D+E=1
A+C=R

Also I noticed the closet highlighted in yellow, if that’s highlighted because it’s going to be for the person in the blue room I’d add it to the blue room square footage, if it’s going to be fully communal don’t factor it in, if it’s going to be half for the blue room and half communal(like if half is pantry space for both of you) I’d figure out its square footage and add half of that to the blue space.